Summarizes GAO's prior and ongoing work examining (1) actions that federal, state, local, and international authorities are taking to adapt to a changing climate, (2) the challenges that federal, state, and local officials face in their efforts to adapt, and (3) actions that the Congress and federal agencies could take to help address these challenges.

Summarizes GAO's prior work examining (1) the challenges in ensuring the quality of carbon offsets in the voluntary market, (2) the effects of and lessons learned from the Clean Development Mechanism (CDM), an international offset program, and (3) matters that the Congress may wish to consider when developing regulatory programs.

This testimony focuses on (1) the importance of quality data on emissions in the context of a program intended to limit greenhouse gas emissions, and (2) key considerations in developing reliable data on greenhouse gas emissions. This testimony is based on several prior GAO reports and a review of related literature.

A hearing to address the research agenda required to mitigate the environmental impact of the transportation infrastructure on the environment, with an emphasis on climate change. Witnesses addressed the components of such an agenda and possible implementation strategies.

This Congressional Testimony before the House Subcommittee on Technology and Innovation, Committee on Science and Technology, explains the progress the Department of Transportation has made in coordinating and reviewing its research activities.